在 shiny R 中使用 plotly 的多線圖

Question

我是 shiny R 和 Plotly 的新手。 我正在嘗試構建一個具有兩個下拉框的儀表板，我們通過這些下拉框和 plot Plotly 圖表進行輸入。 所有數據集都有時間、溫度和重量列。 時間在 x 軸上，對於 y 軸，我們可以 select 溫度或重量或兩者兼而有之。

1. 第一個下拉菜單將輸入到 select 的數據集。

2. 第二個下拉框將輸入 select 來自所選數據集中的變量。 然而，我已經弄清楚的大多數事情，y 軸 label 不會動態變化。 label 正在獲取（輸入$變量）而不是溫度或重量。

這是 shiny r output這里也是可重復的示例和我的代碼

library(shiny)
library(plotly)
library(DT)

df1 <- data.frame("time" = 1:10, "temp" = c(21,15,31,12,23,45,67,34,54,10), "weight" = c(10,20,30,40,65,35,68,89,100,23), stringsAsFactors = FALSE)
df2 <- data.frame("time" = 1:10, "temp" = c(31,65,31,22,23,45,67,54,54,45), "weight" = c(30,20,40,40,65,85,68,89,14,24), stringsAsFactors = FALSE)





    ui <- fluidPage(

            titlePanel( div(column(width = 5, h2('title here')), )),
            # Input: Selector for choosing dataset
            selectInput(inputId = "dataset",
                        label = "Choose a dataset:",
                        choices = c("df1","df2")),

            selectInput(inputId = "variable",
                        label = "Variable selection", 
                        choices = c("temp","weight"),
                        selected = "weight",
                        multiple = FALSE),
            mainPanel(
                    # Output
                    tabsetPanel(type = "tabs",
                                tabPanel("Plot", plotlyOutput('plot')),
                                tabPanel("Data", DT::dataTableOutput("table")),
                                tabPanel("Key_metrics", DT::dataTableOutput("Key_metrics")))
            )
    )

    server <- function(input, output) {
            dataDf <- reactive({
                    temp <- get(input$dataset)

            })

            output$plot <- renderPlotly(
                    plot_ly(dataDf(), x = ~time, y =~get(input$variable), type = 'scatter', mode = 'lines', name = "temp") %>%
                            add_trace(dataDf(), x = ~time, y = ~weight, type = 'scatter', mode = 'lines',name = "weight") 

            )

            output$table <- DT::renderDataTable({
                    dataDf()
            })
            output$Key_metrics <- DT::renderDataTable({

            })

    }

    shinyApp(ui,server)

Answer 1

您可以在layout()中指定軸標簽。 請注意， xaxis和yaxis需要一個列表作為參數（有關詳細信息，請參見此處）：

output$plot <- renderPlotly(
    plot_ly(dataDf(), x = ~time, y =~get(input$variable), type = 'scatter', mode = 'lines', name = "temp") %>%
      add_trace(dataDf(), x = ~time, y = ~weight, type = 'scatter', mode = 'lines',name = "weight") %>%
      layout(xaxis = list(title = "Time"), yaxis = list(title = input$variable))

)

編輯：在評論之后，這里是如何 plot 如果選擇了兩個變量，則為兩行，否則為另一行（不要忘記在selectInput()中放置multiple = TRUE ：

library(shiny)
library(plotly)
library(DT)

df1 <- data.frame("time" = 1:10, "temp" = c(21,15,31,12,23,45,67,34,54,10), "weight" = c(10,20,30,40,65,35,68,89,100,23), stringsAsFactors = FALSE)
df2 <- data.frame("time" = 1:10, "temp" = c(31,65,31,22,23,45,67,54,54,45), "weight" = c(30,20,40,40,65,85,68,89,14,24), stringsAsFactors = FALSE)



ui <- fluidPage(

  titlePanel( div(column(width = 5, h2('title here')), )),
  # Input: Selector for choosing dataset
  selectInput(inputId = "dataset",
              label = "Choose a dataset:",
              choices = c("df1","df2")),

  selectInput(inputId = "variable",
              label = "Variable selection", 
              choices = c("temp","weight"),
              selected = "weight",
              multiple = TRUE),
  mainPanel(
    # Output
    tabsetPanel(type = "tabs",
                tabPanel("Plot", plotlyOutput('plot')),
                tabPanel("Data", DT::dataTableOutput("table")),
                tabPanel("Key_metrics", DT::dataTableOutput("Key_metrics")))
  )
)

server <- function(input, output) {
  dataDf <- reactive({
    temp <- get(input$dataset)

  })

  output$plot <- renderPlotly({

    if (length(input$variable) > 1){
      plot_ly(dataDf(), x = ~time, y =~get(input$variable[1]), 
              type = 'scatter', mode = 'lines', name = "temp") %>%
        add_trace(dataDf(), x = ~time, y = ~get(input$variable[2]), 
                  type = 'scatter', mode = 'lines',name = "weight") %>%
        layout(xaxis = list(title = "Time"))
    }
    else {
      plot_ly(dataDf(), x = ~time, y =~get(input$variable[1]), type = 'scatter', mode = 'lines', name = "temp") %>%
        add_trace(dataDf(), x = ~time, y = ~get(input$variable[1]), type = 'scatter', mode = 'lines',name = "weight") %>%
        layout(xaxis = list(title = "Time"), yaxis = list(title = input$variable))
    }

  })

  output$table <- DT::renderDataTable({
    dataDf()
  })
  output$Key_metrics <- DT::renderDataTable({

  })

}

shinyApp(ui,server)

根據原始答案將您想要的內容作為 y 軸 label 。 請注意，此答案僅在有兩種選擇時才有效。